Quick: Who’s the best sport climber in the world? Well, duh—Chris Sharma, right? For well over a decade, the 27-year-old Sharma has been the sport’s main man. But now a young upstart has some saying his reign could be nearing an end. So who’s scrambling for the title as the world’s best? Chris Sharma and Adam Ondra, who at only 16-years-old is already sending just about every hard line in the world. But is the young Czech good enough to be as good—or better—than you know who? Time will tell. In the meantime, you can judge for yourself here, in this footage of Ondra climbing one of the world’s hardest, “La Rambla,” in Siurana, Spain.